/*
 * @FilePath: \undefinedc:\Users\sxjct\.leetcode\784.字母大小写全排列.cpp
 * @Brief: 
 * @Version: 1.0
 * @Date: 2021-03-25 11:05:20
 * @Author: tianyiyi
 * @Copyright: Copyright@tianyiyi
 * @LastEditors: Mr.Tian
 * @LastEditTime: 2021-03-25 11:34:51
 */
/*
 * @lc app=leetcode.cn id=784 lang=cpp
 *
 * [784] 字母大小写全排列
 */

// @lc code=start
class Solution {
private:
    vector<string> res;
    int flag;
public:
    vector<string> letterCasePermutation(string S) {
        
    
    }
};
// @lc code=end

